//! CPU管理模块
//! 
//! 提供处理器核心的管理和控制功能

use crate::utils::error::{YayaError, Result};

/// CPU核心信息
#[derive(Debug, Clone)]
pub struct CpuCore {
    pub id: u32,
    pub architecture: CpuArchitecture,
    pub features: CpuFeatures,
    pub frequency_mhz: u32,
}

/// CPU架构类型
#[derive(Debug, Clone, PartialEq)]
pub enum CpuArchitecture {
    X86_64,
    AArch64,
    RiscV64,
    Unknown,
}

/// CPU特性标志
#[derive(Debug, Clone)]
pub struct CpuFeatures {
    pub sse: bool,
    pub avx: bool,
    pub neon: bool,
    pub virtualization: bool,
}

/// CPU管理器
pub struct CpuManager {
    cores: Vec<CpuCore>,
    current_core: u32,
}

impl CpuManager {
    /// 创建新的CPU管理器
    pub fn new() -> Result<Self, YayaError> {
        Ok(CpuManager {
            cores: Vec::new(),
            current_core: 0,
        })
    }
    
    /// 初始化CPU子系统
    pub fn init() -> Result<(), YayaError> {
        info!("初始化CPU子系统");
        // 检测CPU核心和特性
        Ok(())
    }
    
    /// 关闭CPU子系统
    pub fn shutdown() -> Result<(), YayaError> {
        info!("关闭CPU子系统");
        Ok(())
    }
    
    /// 获取CPU核心数量
    pub fn core_count(&self) -> usize {
        self.cores.len()
    }
    
    /// 获取当前核心信息
    pub fn current_core(&self) -> Option<&CpuCore> {
        self.cores.get(self.current_core as usize)
    }
    
    /// 切换到指定核心
    pub fn switch_core(&mut self, core_id: u32) -> Result<(), YayaError> {
        if core_id < self.cores.len() as u32 {
            self.current_core = core_id;
            Ok(())
        } else {
            Err(YayaError::InvalidParameter("无效的核心ID".into()))
        }
    }
    
    /// 执行CPU特定指令（特权指令）
    pub unsafe fn execute_privileged(&self, instruction: u64) -> Result<u64, YayaError> {
        // 这里实现特权指令执行
        // 注意：这是unsafe操作，需要谨慎使用
        Ok(instruction)
    }
}

/// 获取全局CPU管理器实例
pub fn get_cpu_manager() -> &'static mut CpuManager {
    static mut CPU_MANAGER: Option<CpuManager> = None;
    
    unsafe {
        if CPU_MANAGER.is_none() {
            CPU_MANAGER = Some(CpuManager::new().unwrap());
        }
        CPU_MANAGER.as_mut().unwrap()
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    
    #[test]
    fn test_cpu_manager_creation() {
        let manager = CpuManager::new();
        assert!(manager.is_ok());
    }
}